fix: add missing outputs
metadata to action.yml
#127
Merged
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This PR adds
outputs
metadata to action.yml. The metadata is explained in the following official document:https://docs.github.com/en/actions/creating-actions/metadata-syntax-for-github-actions#outputs-for-docker-container-and-javascript-actions
Though it is optional, the metadata is useful for some static analysis. For example, actionlint can statically check the outputs are used correctly in a workflow.